Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21228#discussion_r185783283
--- Diff: python/pyspark/sql/functions.py ---
@@ -151,13 +151,15 @@ def _():
_collect_list_doc = """
Aggregate function: returns a list of objects with duplicates.
+ The function is non-deterministic because its result depends on order
of rows.
--- End diff --
I'd use `... note:`
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